Thermostat alarm switch



Oct. 1, 1929. J. A. PAYZANT THEHMQSTAT ALARM SWITCH Filed May 51, 1928 Zlwwzntom J01 Pa yzanf (hung struction shown in the accompanying draw- Patented Opt. 1, 1929 TEST.

PATENT Y OFFICE JOHN A.'PA YZ.ANT, OF SCHUYLEB, NEBRASKA rnnnmosmrunnm swrrcn Application filed May 81,

This invention relates to thermostat alarm switches and more particularly to a device of this character especially adapted for use in brooders, incubators and the like.

An important object of the invention is to produce a device of this character which may be very compactly constructed and which may be readily altered to accommodate it to different temperature ranges. i

A further object of the invention is to provide a device of this character which may be simply and cheaply. constructed, which will be durable and efficient in service and a general improvement in the art.

These and other objects I attain by the conings, wherein for the purpose of illustration is shown a preferred embodiment of my invention and wherein Figure 1 is a side elevation partially in section of a thermostatic switch constructed in accordance with my invention, spare insulating drips being illustrated as secured to the base so that they may be conveniently interchanged to provide a difi'erent range of temperatures;

Figure 2 is a plan view of the switch Figure 3 is a section on the line 3-3 of Figure 1.

Referring now more particularly to the drawings, the numeral 10 generally designates a base which may be adapted in any suitable manner for attaching'to the wall or floor of a brooder or incubator. To this base adjacent one end thereof is secured a thermostat 11 preferably of the wafer type and'adjacent this thermostat, a vertical post 12 extends outwardly from the base. To this post is pivoted a lever 13, one end of which is extended over the thermostat for engagement thereby and the lever has associated therewith means it at present indicated as a counterweight for giving bias to the lever, maintaining said end in engagement with the thermostat 11. Secured to the lever adjacent the opposite end thereof is a stop 15 and surrounding said opposite end is a brush 16 in the form of a sleeve having its outer end closed. A spring 17 extending between the 1928. Serial'Ro. 281,774.

brush and the stop 15 constantly urges the brush outwardly.

The last named end of the lever ext-ends ad-- jacent that end of the base remote from the thermostat and at said end of the base and in opposition to the lever, I provide a contact strip 18 extending in the general plane of swing of the lever and having an angular foot 19 opposing the base and secured thereto by screws 20 or the like. The brush under the influence of the spring will normally engage this strip.

In combination with the contact strip, I employ a combined guide and contact range determining element. Thiselement is in the form of an insulating strip 21 adapted to abut the face of the contact strip 18 op ing the lever and having at its lower end a cot 22 whereby it may be securedto the base. This 10 foot is preferably extended beneath the foot of the contact strip and is held in position by the screws 20 thereof. 4 In the insulating strip 21 are formed openings 23 which are spaced apart a distance depending upon the, 73

range at which the alarm is to be given. The sides of the strip am provided with flanges 24. between which the brush operates and by which the .brush is guided. A plurality of strips 21 may be provided with each instru- S0 ment as suggested in Figure 1, and these strips may be readily interchanged to provide a differentrange of temperatures at which the alarm is to be given. The base 1 to which these strips may be secured may be provided with indicia 25 giving the temperature range obtained by use of the strip. The post 12 will be provided with a binding post for the connection of alarm wires and one of the screws 20 may be conveniently emn ployed for the connection of the other alarm wire.

It will be obvious that as the temperature rises, the thermostat, acting against the end of the lever 13, will shift the lever, so that through the opening and engage the Contact strip substantially instantaneously, thereby preventing the intermittent action ordinarily resulting from thermostatic control of switch 7 elements.

The alarm will be held in its alarm posistier-until manually released, thus assuring prompt attention. if, on. the contrary, the.

temperature lowers, the bias 13 will cause the brush to approach the other of the openin s and finally engage therein.

ince the construction hereinbetore set forth is capable of a certain range of change and modification Without materially departing from the spirit of the invention, 1 do not limit myself to such specific structure except as hereinafter claimed.

I claim l. in a thermostatic alarm switch, a pivoted lever, thermostatic means engaging the lever to shift the same about its pivot in response to changes of temperature, a conduct ing strip opposing the end of the lever, a-

spring-pressed brush carried by the end of the lever for engagement with the strip and an insulating strip interposed between the conducting strip and the brush and having openings therein spaced longitudinally thereof through which the brush may extend to engage the strip.

2, In a thermostatic alarm switch, a pivoted lever, thermostatic means engaging the leverto shift the same; about its pivot in response to changes of temperature, a conductmg strip opposing the end of the lever, a

" spring-pressed brush carried by the end of the lever for engagement with the strip, and an insulating strip interposed between the conducting strip and the brush and having openings therein spaced longitudinally thereof through which the brush may extend to engage the strip, the sides of said insulating strip having guides preventing displacement of the brush from the strip.

3. lln a thermostatic alarm switch, a base,

a lever pivoted intermediate its ends adjacent one end of the base, a thermostatic element disposed at said end of the base and underlying the corresponding end of the lever, means for maintaining said end of the lever in engagement with the thermostatic element,

a conducting strip secured to the opposite end of the base and opposing the other end of the lever, the last named end of the lever having a spring-pressed brush to engage the strip and an apertured insulating strip interposed between the conducting strip and the brush of the lever. Y

; ln a thermostatic alarm switch, a base,

a lever pivoted intermediate its ends adjacent one end of the base, a thermostatic element disposed at said endof the base and underlying the corresponding end of the lever,

tmieans for maintaining'said end of the lever in engagement with the thermostatic elemerit, a conducting strip secured to the oppomaaees site end of the base and opposing the other end of the lever, the last named end of the I lever having a spring-pressed brush to engage the strip, and an apertured insulating strip interposed between-the conducting strip and the brush of the lever, the securing elemerits ofthe conducting strip securing said insulating strip to the base.

5. In a thermostatic alarm switch, a pivoted lever, thermostatic means engaging the lever to shift the same about its pivot in response'to changes of temperature, a con-' of the sleeve and having openlngs therein spaced lon itudinally of the conducting strip through w ich the brush may extend to engage the conducting strip.

lntestiinony whereof I hereunto ailix my signature. 1

' JOHN PAYZANT.

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